Portion of a horizontal-shaft engine



FIG. 1 is a perspective view of a portion of a horizontal-shaft engine showing our new design;

FIG. 2 is a top view thereof; and,

FIG. 3 is a front view thereof.

The broken lines showing environment in FIGS. 1-3 are for illustrative purposes only and forms no part of the claimed design. 

We claim the ornamental design for a portion of a horizontal-shaft engine, as shown and described. 